Enhancement: Upgrade to PHPStan 1.8.1

Author: OskarStark

Dockerfile

@@ -16,7 +16,7 @@ ENV COMPOSER_HOME=/composer
 
 RUN echo "memory_limit=-1" > $PHP_INI_DIR/conf.d/memory-limit.ini
 
-ENV VERSION=1.8.0
+ENV VERSION=1.8.1
 
 RUN composer global require phpstan/phpstan $VERSION \
     && composer global require phpstan/extension-installer \

action.yml

@@ -12,4 +12,4 @@ name: 'OSKAR-phpstan'
 
 runs:
     using: 'docker'
-    image: 'docker://oskarstark/phpstan-ga:1.8.0'
+    image: 'docker://oskarstark/phpstan-ga:1.8.1'